Here is an excerpt from the Syntax Assistant's help topic on the SystemInfo.PlatformType property:
Type: PlatformType; Undefined.
The current platform type.
Thin client, web-client, Mobile client, server, thick client, external connection, Mobile application (client), Mobile application (server).
If the platform type differs from the PlatformType type in the web client mode, contains Undefined.
Contains Undefined if the mobile 1C:Enterprise is used. >>
So, by using this property, you can at least learn whether the application's 1C:Enterprise platform runs on a desktop OS or on a mobile OS.